Comparison: Best Miracle Gro Organic Potting Soil (Updated | Nov 11th)
We’ve dug into the details, tested the textures, and watched how plants respond to help you find the top pick. Whether you’re growing herbs on a windowsill or tomatoes in a raised bed, we’ll break down what makes each blend special—so you can grow with confidence.
- Best for quick-release feed: Miracle-Gro Organic Outdoor Potting Mix
- Best for water-balance mix: Miracle-Gro Organic Indoor Potting Mix
- Best for large outdoor pack: Miracle-Gro Organic Outdoor Potting Mix
- Best for outdoor duo pack: Miracle-Gro Organic Outdoor Potting Mix
- Best for indoor duo pack: Miracle-Gro Organic Indoor Potting Mix
- Best for indoor bulk pack: Miracle-Gro Organic Indoor Potting Mix
- Best for six-month boost: Miracle-Gro Potting Mix
- Best for premium organic blend: Miracle-Gro Performance Organics All Purpose Container Mix with Natural and Organic Ingredients
- Best for peat-free premium: Back to the Roots 100% Organic Potting Mix (Value 12 Quart) | Premium Blend | Made in The USA
- Best for gnat-resistant mix: Miracle-Gro Indoor Potting Mix
Product Comparison: Best Miracle Gro Organic Potting Soil
Miracle-Gro Organic Outdoor Potting Mix, for Outdoor Container Plants, Contains Quick-Release Natural Fertilizer, OMRI Listed, 16 qt.
- Miracle-Gro Organic Outdoor Potting Mix contains a quick-release natural fertilizer and also feeds plants for up to 2 months
- This potting mix is made with responsibly sourced peat (one hundred percent of peat sourced from certified producers)
- Use this organic potting mix with all types of outdoor container plants, including flowers, vegetables, herbs, annuals, and perennials
- To plant in pots, fill the container partially full with potting mix, place the plant in the pot after loosening the root ball, cover with more mix and water thoroughly
- One 16 qt. bag of Miracle-Gro Organic Outdoor Potting Mix fills one 12-inch container (amounts may vary based on the size of the root ball)
Miracle-Gro Organic Indoor Potting Mix, Protects Against Over and Under Watering, for Indoor Container Plants, Houseplants and Starter Plants, OMRI Listed, 16 qt.
- Miracle-Gro Organic Indoor Potting Mix protects indoor plants against over and under watering
- This organic container mix is made with responsibly sourced sphagnum peat moss (one hundred percent of peat sourced from certified producers), coir, and quick-start natural fertilizer
- Use this potting medium with all types of indoor container plants, including houseplants and herbs; also great for seed starting
- To plant seeds, fill container with potting mix, follow seed package planting directions, and water; To use with transplants, partially fill container, place plant after loosening the root ball, cover with more mix pressing lightly, and water
- One 16 qt. bag of Miracle-Gro Organic Indoor Potting Mix fills one 12-inch container (amounts may vary based on the size of the root ball)
Miracle-Gro Organic Outdoor Potting Mix, for Outdoor Container Plants, Contains Quick-Release Natural Fertilizer, OMRI Listed, 25 qt.
- Miracle-Gro Organic Outdoor Potting Mix contains a quick-release natural fertilizer and also feeds plants for up to 2 months
- This potting mix is made with responsibly sourced peat (one hundred percent of peat sourced from certified producers)
- Use this organic potting mix with all types of outdoor container plants, including flowers, vegetables, herbs, annuals, and perennials
- To plant in pots, fill the container partially full with potting mix, place the plant in the pot after loosening the root ball, cover with more mix and water thoroughly
- One 25 qt. bag of Miracle-Gro Organic Outdoor Potting Mix fills three 10-inch containers (amount may vary based on the size of the root ball)
Miracle-Gro Organic Outdoor Potting Mix, for Outdoor Container Plants, Contains Quick-Release Natural Fertilizer, OMRI Listed, 16 qt., 2-Pack
- Miracle-Gro Organic Outdoor Potting Mix contains a quick-release natural fertilizer and also feeds plants for up to 2 months
- This potting mix is made with responsibly sourced peat (one hundred percent of peat sourced from certified producers)
- Use this organic potting mix with all types of outdoor container plants, including flowers, vegetables, herbs, annuals, and perennials
- To plant in pots, fill the container partially full with potting mix, place the plant in the pot after loosening the root ball, cover with more mix and water thoroughly
- This bundle includes two 16 qt. bags of Miracle-Gro Organic Outdoor Potting Mix; each fills one 12-inch container (amounts may vary based on the size of the root ball)
Miracle-Gro Organic Indoor Potting Mix, Protects Against Over and Under Watering, for Indoor Container Plants, Houseplants and Starter Plants, OMRI Listed, 8 qt., 2-Pack
- Miracle-Gro Organic Indoor Potting Mix protects indoor plants against over and under watering
- This organic container mix is made with responsibly sourced sphagnum peat moss (one hundred percent of peat sourced from certified producers), coir, and quick-start natural fertilizer
- Use this potting medium with all types of indoor container plants, including houseplants and herbs; also great for seed starting
- To plant seeds, fill container with potting mix, follow seed package planting directions, and water; To use with transplants, partially fill container, place plant after loosening the root ball, cover with more mix pressing lightly, and water
- This bundle includes two 8 qt. bags of Miracle-Gro Organic Indoor Potting Mix; each bag fills two 8-inch containers (amounts may vary based on the size of the root ball)
Miracle-Gro Organic Indoor Potting Mix, Protects Against Over and Under Watering, for Indoor Container Plants, Houseplants and Starter Plants, OMRI Listed, 16 qt., 2-Pack
- Miracle-Gro Organic Indoor Potting Mix protects indoor plants against over and under watering
- This organic container mix is made with responsibly sourced sphagnum peat moss (one hundred percent of peat sourced from certified producers), coir, and quick-start natural fertilizer
- Use this potting medium with all types of indoor container plants, including houseplants and herbs; also great for seed starting
- To plant seeds, fill container with potting mix, follow seed package planting directions, and water; To use with transplants, partially fill container, place plant after loosening the root ball, cover with more mix pressing lightly, and water
- This bundle includes two 16 qt. bags of Miracle-Gro Organic Indoor Potting Mix; each bag fills one 12-inch container (amounts may vary based on the size of the root ball)
Miracle-Gro Potting Mix, For Container Plants, Flowers, Vegetables, Annuals, Perennials, Shrubs, Feeds for up to 6 Months, 16. qt., 2-Pack
- Miracle-Gro Potting Mix feeds container plants for up to 6 months so you get more blooms for more color (vs. unfed plants)
- How to use: To use this potting medium, fill a container about 1/3 full with potting mix, place your plant in the soil, and fill the rest of the pot, pressing lightly
- What’s included: This bundles includes two 16 qt. bags of Miracle-Gro Potting Mix, each able to fill one 12-inch container (exact amounts may vary based on root ball size)
- Where to Use: Use this home gardening product with all types of container plants, including annual and perennial flowers, vegetables, herbs and shrubs
- This potting soil mix Grows Plants Twice As Big (vs. unfed plants)
Miracle-Gro Performance Organics All Purpose Container Mix with Natural and Organic Ingredients, Feeds Container Grown Vegetables, Flowers and Herbs for up to 3 Months, 1 cu. ft.
- Organic Goodness: Grow vibrant flowers, herbs, and veggies with Miracle-Gro Performance Organics All Purpose Container Mix made with organic and natural ingredients, like aged compost, for the spectacular results you expect
- Bountiful Harvests: Get twice the bounty versus unfed plants for more container-grown vegetables, flowers, and herbs
- How to Use: Perfect for all your indoor and outdoor container gardening, simply fill your favorite pots with this potting soil and watch your flowers, vegetables, and herbs thrive
- Nourish: This premium organic container soil provides continuous plant nutrition for up to 3 months, helping your potted plants flourish
- Trusted Results: Grow confidently with this OMRI Listed container mix that gives you the Miracle-Gro results you love with the organic and natural ingredients you want
Back to the Roots 100% Organic Potting Mix (Value 12 Quart) | Premium Blend | Made in The USA
- 100% Organic and Peat-Free: Our potting mix is 100% organic and peat-free—made from upcycled plant matter and wood fines from across the U.S. No imported peat, just better soil with a lighter carbon footprint.
- All-Purpose: Our premium potting mix is versatile and well-suited for herbs, veggies, fruits, and flowers. It caters to all your gardening needs, and is proudly made in the USA.
- Better Moisture Control and pH Balance: Our premium soil blend incorporates yucca extract for moisture control and dolomitic limestone for pH balancing.
- 100% Satisfaction Guarantee: Not satisfied? Let us know. Our support team will get you growing with a replacement or refund—no questions asked.
- GROWONEGIVEONE — Share a photo of your growing garden and we’ll donate a Kids Grow Kit and STEM elementary school curriculum to a classroom of your choice.
Miracle-Gro Indoor Potting Mix, Blended for a Variety of Houseplants, Feeds for up to 6 Months, 16 qt., 2-Pack
- Miracle-Gro Indoor Potting Mix feeds houseplants for up to 6 months and is designed to be less prone to gnats (contains no compost or bark, which are known to shelter fungus gnats)
- This potting mix contains coconut coir, which holds and releases water and helps soil re-wet
- Where to use: Blended for a wide variety of indoor container plants, including climbing, foliage, flowering, and tropical plants
- How to use: To use, fill a container about 1/3 full with potting mix; add more mix after placing your plant in the pot
- What’s included: This bundles includes two 16 qt. bags of Miracle-Gro Indoor Potting Mix, each able to fill one 12-inch containers (exact amount may vary based on the root ball size)
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Buying Guide
FAQs
How do the indoor and outdoor organic potting mixes differ in composition?
The indoor mix combines sphagnum peat moss, coir, and a quick‑start natural fertilizer, while the outdoor mix uses responsibly sourced peat and a quick‑release fertilizer. Indoor formulas are designed to balance moisture and prevent over‑watering, whereas outdoor blends focus on durability and nutrient release for harsher conditions. Both are OMRI‑listed, but the texture and water‑holding properties vary to suit their environments.
Which size bag offers the best value for a medium‑sized garden?
For a garden with several 10‑inch to 12‑inch containers, the 25‑quart outdoor bag (one bag fills three 10‑inch pots) provides a lower cost per quart compared with multiple 16‑quart bags. If you need flexibility, the two‑bag bundles of 16‑quart outdoor mix give you two containers plus extra for top‑ups. Consider the number of pots you plan to fill and the expected nutrient duration when choosing size.
Can I use the indoor organic mix for seed starting?
Yes, the indoor organic mix is ideal for seed starting because it includes coir for moisture retention and a balanced fertilizer that supports early growth. Its sterile formulation also reduces the risk of fungus gnats, which can harm seedlings. Follow the seed packet directions and keep the mix evenly moist for best results.
What are the benefits of the quick‑release natural fertilizer in the outdoor mix?
The quick‑release fertilizer provides nutrients that become available within days, giving plants an immediate boost after planting. It sustains feeding for up to two months, reducing the need for supplemental feeding during the early growing season. This can lead to stronger, faster‑growing plants with more blooms or yields.
Is the Performance Organics All Purpose Container Mix a good alternative to the regular organic mixes?
Performance Organics uses aged compost and other natural ingredients, offering continuous nutrition for up to three months, which is longer than the two‑month feed of the standard organic mixes. It is OMRI‑listed and marketed for both indoor and outdoor use, making it a versatile option. However, it may be priced higher, so weigh the extended feeding period against your budget.
How does the Back to the Roots 100 % Organic Potting Mix compare to Miracle‑Gro’s organic options?
Back to the Roots is peat‑free, using upcycled plant material and wood fines, which reduces its carbon footprint compared with Miracle‑Gro’s peat‑based mixes. It includes yucca extract for moisture control and dolomitic limestone for pH balance, features not highlighted in Miracle‑Gro products. While it may lack the quick‑release fertilizer, its all‑organic profile appeals to gardeners seeking a fully peat‑free solution.
What should I consider when choosing between a single bag and a bundle of potting mix?
Bundles often provide a lower price per quart and ensure you have enough mix for multiple containers or future top‑ups, which is useful for larger projects. Single bags give more flexibility if you only need a small amount or want to test a product first. Check the total volume needed for your containers and compare the per‑quart cost before deciding.
Do the indoor mixes help prevent fungus gnats?
Yes, the indoor mixes are formulated without compost or bark, which are common habitats for fungus gnats. The inclusion of coconut coir helps retain moisture without creating overly wet conditions that attract gnats. Proper watering practices and good drainage further reduce the likelihood of gnat infestations.